showimage.java

180个针对Java初学者的简单实例,包含了180個適合與初學者的源碼實例

//ShowImage.java
import java.awt.*;
import java.awt.image.*;
import java.applet.Applet;
//ShowImage.java演示了在Applet中演示单个图片
public class ShowImage extends Applet {
     Image imgObj;
     int   process;
     public void init( ){
        imgObj=getImage(getCodeBase(),"picture.jpg");
      }
      public void paint(Graphics show){
          show.drawImage(imgObj,0,0,this);
      }
     public boolean imageUpdate(Image img,int flags,int x,int y,int w, int h){
             //ALLBITS,ERROR,SOMEBITS为ImageObserver中定义的常数标志
             if( ( flags&SOMEBITS ) != 0 )
             {
                process += h;
                int per=process*100/img.getHeight(this);
                if(per<100)
                showStatus("please waiting ...loading："+per+"%");
                else
                showStatus("done");
                repaint(x,y,w,h);
             }
              if((flags&ERROR)!=0)
              {
                 System.out.print("loading error!");
              }
             return (flags&(ALLBITS|ERROR))==0;
      }
}